Explanation
Get + adjective refers to the realization of the condition expressed in the adjective. The subject experiences the action or condition.
Steve left his car windows down last night when it rained. The interior of his car got wet. The meaning is that the interior of his car became wet.
You are going to get hungry during class if you don't eat breakfast. You will become hungry during class if you don't eat breakfast.
When the continuous form is used, the condition or action expressed in the adjective is beginning to be realized.
I'm getting tired. The idea is I am beginning to be tired or I am becoming tired. Compare this with I am tired.
The following are some adjectives used with get.
get hungry, get thirsty, get ready, get late, get serious, get well, get dry, get dark, get cold, get hot, get anxious, get impatient, get sick, get fat, get busy, get angry, get old, get bald, get thin